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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e036c6fb1a9893e395bf3d9c494ef878d4a64bde6d76497d8de6ad3483cde949' 
  AND token = '5HffEOh3A8rdc/WfepDvrQ7V5ROQXLAVYhZlP+Njr9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}